JPH07215687A - Emergency stop auxiliary device for shaft winch - Google Patents

Abstract

PURPOSE:To provide an emergency stop auxiliary device with a simple structure which can stop the rotation of a shaft winch completely and promptly if a winding accident occurs during the operation of the shaft winch, and provide safe use of the shaft winch which serves as a simple rotational force taking-out means. CONSTITUTION:A sensor box 5 which builds in a foreign matter sensor 6 is supported, being hung so as to be attached and removed to/from the load carrying platform 42 of a vehicle 4. The central foreign matter sensor 6 is positioned just above the winch roller 3 of the shaft winch which is mounted onto a driving wheel W from the outside. A worker who approaches a prescribed working region near the winch roller 3 is detected as a foreign matter by this foreign matter sensor 6 and foreign matter sensors on both sides, and if this detection is done, the engine E of the vehicle 4 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop assist device for a shaft winch, which is adapted to take out rotation of an axle by retrofitting it to the outside of a drive wheel and utilize it as a rotational force for various works.

[0002]

2. Description of the Related Art A shaft winch has been conventionally used as a simple device for obtaining a rotating force required for various works performed outdoors, such as laying various cables in electric installation work and raising poles. Has been. This is used by connecting the output of an engine mounted on a vehicle to one of the left and right axles that is transmitted through a differential device (differential unit) from the outside of drive wheels driven by this axle. By utilizing the characteristics of the moving device, only the rotation of the axle is taken out while the grounding state of the driving wheels is maintained.For example, it is retrofitted to the transmission system of a general-purpose truck used for carrying work tools. By doing so, there is an advantage that the rotational force using the engine mounted on the truck as a drive source can be easily used without the need to jack up the drive wheels.

FIG. 4 is a schematic diagram showing the structure of a transmission system for driving wheels of a vehicle. In the figure, D is a differential unit, which distributes the rotational force transmitted from an engine (not shown) to a pair of axles S ₁ and S ₂ projecting on the left and right sides, and attaches to the tips of these axles. It is a known mechanical element that is transmitted to the drive wheels W, W (only the axle S ₁ side is shown).

Protective tubes 11, 11 are connected to both sides of a housing that rotatably supports a differential device D, coaxially with an output end 10 on each side. The drive wheel W has a structure in which a wheel hub 13 is rotatably supported on the tip of the corresponding protection tube 11 via bearings 12 and 12, and a tire 15 is circumferentially attached to the outer periphery of the wheel hub 13. Has become. FIG. 4 shows a state in which the axle S ₁ is removed, and the axle S ₁ is
The spline 16 which is inserted from the outside of the wheel hub 13 into the protective tube 11 and is formed on the outer periphery of one end is connected to the output end 10 on the same side.
A hub cap 17 fixed to the wheel hub 13 is screwed and fixed to the wheel hub 13 from the outside while being engaged with a spline (not shown) formed on the inner periphery of the wheel hub and connected to the differential device W. It is connected. The other axle S
_{The connection of 2} with the differential device D and the drive wheel W is made in the same manner.

In the transmission system as described above, the driving force transmitted from the engine to the differential gear D is distributed to the output terminals 10, 10 on both sides by the operation of the differential gear D, and the axles S connected to each of them. ₁ , S ₂ and hub cap 1 of these tips
It is transmitted to drive wheels W, W via 7 and 17, and these are rotationally driven. At this time, the distribution of the driving force in the differential device D is
This is done according to the magnitude of the load acting on the axles S ₁ and S ₂ on the left and right sides, and most of the driving force is the axle S on the side with the light load.
_When transmitted to ₁ (or S ₂ ) and the magnitude ratio of the load is large, the other axle S ₂ (or S ₁ ) is in a non-rotating state.

[0006] Shaft winches, using the characteristics of the above-described differential device D, are connected from the outside of the drive wheels W ipsilateral to one axle S ₁ (or S _2), an axle S ₁ (or S
_It takes out the rotational force of ₂ ). 5 and 6 show
FIG. 6 is an operation explanatory view of the shaft winch, and as shown in the figure, the shaft winch includes an adapter 2 for fixing to the drive wheel W, and a winch roller 3 detachably attached to the outside of the adapter 2. . FIG. 5 shows a state in which the winch roller 3 is removed, and FIG. 6 shows a state in which the winch roller 3 is attached.

As shown in the figure, the adapter 2 has a cylindrical housing 20 that is screwed and fixed to the outside of the wheel hub 13 by using a screw hole for mounting the hub cap 17, and coaxially inside the housing 20. And a transmission shaft S stored therein. The base end of the housing 20 faces the tip of the protection tube 11 that rotatably supports the wheel hub 13, and the transmission shaft S extends into the protection tube 11 through an opening on the base end side of the housing 20. Axle on the same side S ₁ (or S
Instead of ₂ ), it is spline-coupled to the output terminal 10 of the differential device D (not shown).

The transmission shaft S is urged in the axial direction toward the opening on the tip end side of the housing 20 by the spring force of the coil spring 21 built in the housing 20, and the tip end in the urging direction is , An engaging portion 22 having a predetermined length formed by forming a spline on the outer peripheral surface is provided. As shown in FIG.
Engages with a spline formed on a part of the inner circumference of the housing 20 to integrally connect the transmission shaft S and the housing 20. In this case, the rotation of the transmission shaft S depends on the housing
20 and the wheel hub 13 to drive wheels W,
The rotation of the drive wheel W on the other side allows the vehicle to travel.

On the other hand, on the front end side of the transmission shaft S, there is provided an engagement hole 23 (see FIG. 6) having an opening at the axial center of the end face and forming a spline on the inner peripheral face. The winch roller 3 attached to the adapter 2 has a short cylindrical boss portion.
On one side of 30, a drum 31 having a large-diameter drum shape is rotatably supported. The rotary shaft 32 of the winding drum 31 penetrates the boss portion 30 and is projected to the other side, and a spline 33 which is aligned with the spline of the inner circumference of the engagement hole 23 is formed on the outer periphery of the protruding side end portion. Has been done.

The winch roller 3 is attached to the adapter 2 by inserting the latter into the opening at the front end of the housing 20 and the latter boss portion 30.
It is done by fitting. With this attachment, the rotating shaft
The spline 33 formed in 32 is an engaging hole 23 at the tip of the transmission shaft S.
On the other hand, when the rotary shaft 32 is pushed into the housing 20, the transmission shaft S is pressed toward the inner side against the bias of the coil spring 21, and as shown in FIG. Joint part 22
As a result of the disengagement between the housing 20 and the housing 20, the rotation of the transmission shaft S is transmitted to the winding drum 31 via the rotation shaft 32, and the work such as winding of the cable wound around the winding drum 31 becomes possible. Become.

At this time, the drive wheel W connected to the other axle S ₂ (or S ₁ ) is in a state of supporting the vehicle weight and grounded, and the load of this axle S ₂ (or S ₁ ) is the shaft. Since the load on the axle S ₁ (or S ₂ ) on the side where the winch is attached is significantly larger, the driving force is transmitted only to the side where the shaft winch is attached due to the characteristics of the differential device D, and the other axle. S ₂ (or S ₁ ) will not rotate and the vehicle will remain stationary. Actually, a sealing mechanism inside the housing 20 for lubricating the movable part and a lock mechanism for preventing the winch roller 3 from coming off are provided, but these are not shown in FIGS. 5 and 6. Omitted.

[0012]

As described above, the shaft winch can obtain a rotational force by being easily attached to the outside of the driving wheel W of the vehicle, and the driving wheel W need not be jacked up during this period. Also, it has an advantage that it can be switched to normal running by removing only the winch roller 3, and it is performed outdoors such as laying various cables in electric installation work and raising utility poles. Its use is desired in various operations.

However, in a work using a shaft winch, for example, a cable laying work, a worker touches a cable which is wound up and sent out by the shaft winch, and is caught in a winch roller which is a rotating portion together with the cable. Has been reported to occur,
For this reason, the use of the shaft winch is actually limited on the assumption that the operation means is capable of performing an emergency stop in the event of a car accident.

The operation means for emergency stop is an emergency stop switch equipped in a switch box at the tip of the signal cable pulled out from a part of the vehicle, and is arranged in advance at a position where it can be operated during work. It is used to stop the engine, which is the drive source of the shaft winch, when operated in the event of a car accident. However, the work that the use of the shaft winch is longing for is often performed by a small number of workers (sometimes one person) at night when there is little traffic, such as the above-mentioned electrical equipment work. If the above occurs, it is difficult to promptly operate the emergency stop switch as described above, and there is a drawback that the original purpose of preventing the occurrence of personal injury cannot be fulfilled.

Further, in order to enable quick operation in an emergency, it is conceivable that the switch box is carried around during work, but in this case, the work range is limited by the routing of the signal cable connected to the switch box. Inconvenience occurs. This inconvenience is ameliorated by a configuration in which a switch box that wirelessly outputs a stop signal according to the operation of the emergency stop switch is provided and the signal cable is abolished, but it is inconvenient to carry the switch box and each worker carries it. It requires a plurality of switch boxes to do so, and there is a drawback that the equipment cost rises.

Further, a common fatal problem in these is that when an accident occurs during work performed by one worker, the worker who is involved in the accident is forced to perform a switch operation. It is extremely difficult to perform such operations, and it is impossible to prevent the occurrence of a car accident.

On the other hand, as a measure for preventing the occurrence of an accident involving the shaft winch during use, the periphery of the winch roller 3 which projects and rotates to one side of the drive wheel W is covered with an appropriate cover to make contact with a worker. It is effective to eliminate the fear of. However, when this method is carried out, it is troublesome that the cover needs to be attached and detached in preparation for this work each time a new work is started, which is not a practical measure.

As described above, the use of the shaft winch is restricted from the viewpoint of preventing the occurrence of the accident of entrainment, and the conventional accident prevention measures are inconvenient to hinder the work in the surrounding area. Despite the fact that it is a simple device for obtaining a rotating force in various outdoor works, it is the fact that it is not fully utilized.

The present invention has been made in view of the above circumstances, and provides an emergency stop assisting device having a simple structure capable of surely and promptly performing an emergency stop in the event of an accident while the shaft winch is in use. An object of the present invention is to enable the safe use of the winch without hindering the execution of normal work and to expand the range of use of the shaft winch as a simple means for extracting the rotational force.

[0020]

SUMMARY OF THE INVENTION An emergency stop assist device for a shaft winch according to the present invention relates to an axle for transmitting driving force of an engine mounted on a vehicle to an axle that is transmitted through a differential device to drive wheels of the axle. A device for automatically stopping in an emergency a shaft winch that is detachably connected from the outside and that takes out the rotation of the axle as a rotational force for external work while maintaining the grounding state of the drive wheels. A foreign matter sensor that is detachably attached to a part and that detects a foreign matter existing in a predetermined work area including an extension line to the outside of the axle, and engine control that stops the engine according to the detection of the foreign matter sensor And means.

In addition to this, the engine control means is
Stopping the engine by closing a fuel cutoff valve arranged in the fuel supply system of the engine, and means for detecting the stop of the engine, and opening the fuel cutoff valve in response to the detection by the means. And a foreign matter sensor that emits light toward the work area and captures reflected light from the foreign matter to change its output, or the work area. Each of the ultrasonic sensors emits an ultrasonic wave toward the target and catches a reflected wave from the foreign matter to change its output.

[0022]

According to the present invention, when a worker is getting caught in the shaft winch, the foreign matter sensor detachably attached to a part of the vehicle performs a predetermined work including the extension line of the axle to which the shaft winch is connected. The worker is detected as a foreign substance existing in the area, and the engine is stopped in response to the detection, and the rotation of the shaft winch driven by the engine is stopped to prevent the occurrence of a entanglement accident.

Further, the engine is stopped surely and promptly by closing the fuel cutoff valve arranged in the fuel supply system, and the engine stop caused by this operation is detected. Accordingly, the fuel cutoff valve is automatically returned to the open position so that the engine can be restarted after the stop. Further, as the foreign matter sensor, an optical sensor or an ultrasonic sensor that emits light or ultrasonic waves toward a predetermined work area and captures reflection from the foreign matter to change its output is used to detect the presence of the foreign matter in the work area. Is detected without error.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a schematic side view of a vehicle equipped with an emergency stop assist device for a shaft winch according to the present invention (hereinafter referred to as the device of the present invention). In the figure, a vehicle 4 equipped with the device of the present invention has a pair of left and right steering wheels (front wheels) W ',
W'and drive wheels (rear wheels) W and W (both are shown on one side only) are grounded on a road surface R, and a cab 41 is provided at a front portion of a vehicle body frame 40 supported by these and a loading platform 42 is provided at a rear portion thereof. It is a truck equipped with.

The driver's cab 41 is constructed so that it can be opened in a forward tilted state with the vicinity of the front edge of the vehicle body frame 40 as a pivot for inspecting the engine E mounted on the lower portion thereof. After deceleration by the transmission, the output of the engine E is transmitted to a transmission system configured as shown in FIG. 4 via a propeller shaft extending in the front and rear direction, distributed by a differential device D, and left and right drive wheels W, It is transmitted to W and the vehicle 4 travels by these rotations.

As shown in FIG. 1, a shaft winch is attached to the outside of one driving wheel W. This shaft winch has the structure shown in FIG. 6 and takes out the rotation transmitted to one drive wheel W as the rotation of the winch roller 3 protruding to the outside of the drive wheel W. The winch roller 3 is used, for example, in a cable laying operation by winding a cable C drawn out from a cable drum (not shown) arranged on one side, and rotation of the winch roller 3 is performed by winding the wound cable. Pull out C from the cable drum, and as shown by the arrow in the figure,
It acts to send out sequentially to the other side.

The shaft winch can also be used in other operations requiring rotational force. For example, when installing a utility pole, the wire fastened in the middle of the utility pole is wound around the winch roller 3 and wound by the above-described rotation, whereby the utility pole can be raised. Such rotation of the winch roller 3 causes the drive wheels W, W as shown in the drawing.
It can be used without the need for jacking up.

In order to make an emergency stop of the shaft winch attached as described above, the switch box 44 is attached to the tip of the signal cable pulled out from the circuit box 43 located under the loading platform 42. Is provided with a push button type emergency stop switch 45 and a restart switch 46 (both refer to FIG. 3).

On the other hand, a sensor box 5 including a drive wheel W and a portion directly above the axial center portion of the winch roller 3 and having an appropriate length is attached to the front side of the drive wheel W to which the shaft winch is attached. There is. FIG. 2 is an enlarged perspective view showing the vicinity of the mounting position of the sensor box 5.

As shown in the figure, the sensor box 5 is a hollow long rectangular box, and three rectangular windows 50, 50, 50 that open in the center and near both ends of one surface (front surface) are formed. Three foreign matter sensors 6, 6, 6 are attached to the inside of 5 so as to face the rectangular windows 50, 50, 50, respectively. The foreign matter sensor 6 shown in the figure projects the light in a direction substantially perpendicular to the opening surface of the corresponding rectangular window 50 (see FIG. 3).
And a light receiving portion 6b (see FIG. 3) that receives light incident through the rectangular window 50.
It is configured to perform a switch operation that turns on when the amount of light received by the light receiving unit 6b reaches a predetermined level.

The foreign matter sensor 6 has a corresponding rectangular window.
An ultrasonic sensor comprising a transmitting unit that emits ultrasonic waves in a direction substantially perpendicular to the opening surface of 50 and a receiving unit that receives ultrasonic waves that enter through the rectangular window 50, and the receiving unit A switch operation that turns on when the reception level reaches a predetermined value may be performed.

On the back side of the sensor box 5, a pair of flat suspension arms 51, 51 are attached in the vicinity of both ends so as to swingably support their respective bases. At the tips of these suspension support arms 51, 51, hooking portions 52, 52 are formed by bending them in a hook shape in the thickness direction.
2, for example, as shown in FIG. 2, hook the hanging portions 52, 52 of the suspension support arms 51, 51 on the side plate 42a of the cargo bed 42,
By tightening the setscrews 53, 53 attached to each, it is hung along the side surface of the bed 42, that is, along the direction orthogonal to the axis of the drive wheel W and the winch roller 3 attached thereto. Supported.

To fix the sensor box 5, as shown in FIG. 1, the central foreign matter sensor 6 is positioned almost directly above the winch roller 3 by adjusting the front and rear positions, and the set screw 5 is used.
By adjusting the opening angle of the suspension arms 51, 51 before tightening the 3, 53, the separation height of the winch roller 3 above is appropriately set. By this fixing, the foreign matter sensors 6, 6, 6 mounted inside the sensor box 5
Is a predetermined area in the front-rear direction around the extension line of the axle (S ₁ or S ₂ ) of the drive wheel W to which the shaft winch is attached, that is, a predetermined work area set around the shaft winch. Ultrasonic waves are emitted, and the reflected light or reflected wave from the foreign matter present in this work area is captured.

The detection area in the extension line direction of the axle can be appropriately set by adjusting the sensitivity of each foreign matter sensor 6, and by adjusting the sensitivity and adjusting the fixed position of the sensor box 5, the winch roller that serves as the rotating portion of the shaft winch. 3, detection areas can be set appropriately in the up, down, front and back, and left and right directions, and when a worker approaches the circumference of the winch roller 3 excessively, the presence of this worker is determined by the detection area. It is reliably detected as a foreign substance existing inside.

When an optical sensor is used as the foreign matter sensor 6, the brightness of the surroundings, the color of the clothes of the worker who becomes the reflector, etc.
It is further necessary to adjust the sensitivity according to the detection conditions. However, this sensitivity adjustment is a rough adjustment for keeping the detectable range on the safe side, and does not complicate a complicated operation.

The sensor box 5 is provided to protect the foreign matter sensors 6, 6 and 6 installed therein without being exposed to wind and rain, and to attach and detach the three foreign matter sensors 6, 6 and 6 collectively. is there. When importance is attached to protection from wind and rain, the above-mentioned optical sensors are used as the foreign matter sensors 6, 6, 6 and the rectangular windows 50, 50, 50 are provided corresponding to each of them.
May be liquid-tightly sealed by a transparent cover, and light may be projected and received through these. Such encapsulation is not necessary under normal use conditions and the rectangular window 5
The numbers 0, 50 and 50 may be formed so as to directly open to the outside.

The foreign matter sensor 6 may be directly attached to a part of the vehicle body such as the side plate 42a of the luggage carrier 42 without using the sensor box 5 as described above. The number of foreign matter sensors 6 is not limited to the above three, but an appropriate number of foreign matter sensors 6 can be provided under the condition that foreign matter (worker) can be detected in a predetermined work area near the shaft winch.
Should be installed. Further, as the foreign matter sensor 6, a sensor having another configuration can be used in place of the above-described optical sensor or ultrasonic sensor, but it is possible to reliably detect the foreign matter, and it is small and lightweight and inexpensive. If selected under certain conditions, it is currently preferable to employ an optical sensor or ultrasonic sensor.

The foreign matter sensor 6 inside the sensor box 5
6 and 6 are connected via a connection cable 54 extending outside the sensor box 5 to a connector 47 provided on the lower part of the loading platform 42 facing the side surface, and the output signal of the foreign matter sensor 6 is , Is supplied to the circuit box 43 via the connection cable 54 and the connector 47, and power is supplied to the foreign matter sensor 6 from the circuit box 43 via the connector 47 and the connection cable 54.

Contrary to the case of attachment, the sensor box 5 is removed by loosening the setscrews 53, 53 and the side plate of the loading platform 42.
Remove the latches 52, 52 from 42a and connect the cable.
The sensor box 5 is detached from the connector 47 by the procedure of pulling out the connector 47, and the suspension arms 52 and 52 are folded so that the sensor box 5 overlaps with the back surface of the connector. It can be transported with tools. Even during this transportation, the foreign matter sensors 6, 6, 6 built in the sensor box 5 are protected from collision with the working tool or a part of the vehicle body, and there is little risk of damage to them, and When used, reliable operation is guaranteed.

FIG. 3 is a block diagram of the control system of the device of the present invention. When the foreign matter sensor 6, 6, 6 arranged as described above detects a foreign matter in the work area, the device of the present invention is caught by the excessive approach of the worker near the rotating winch roller 3. It is determined that an accident is occurring or there is a risk of an entrainment accident, and in order to prevent this accident, the operation of stopping the rotation of the winch roller 3 is performed. In this case, the engine E of the vehicle 4, which is the drive source of the shaft winch, is stopped.

The main parts of the control system of the device of the present invention are a power relay 43a and a control relay 43b mounted in the circuit box 43. As shown in the figure, the power relay 43a is normally in the off state and is turned on by exciting the built-in coil. On the contrary, the control relay 43b is always in the on state and excited by the built-in coil. It is configured to be turned off, and these are connected in series and are interposed between the fuel cutoff valve 7 arranged in the fuel supply system of the engine E and the power supply.

The fuel cutoff valve 7 is a solenoid valve that performs a closing operation in response to the energization of the built-in solenoid and cuts off the fuel supply to the engine E. The solenoid is energized when both the power relay 43a and the control relay 43b are in the on state, and the engine E is stopped by closing the fuel cutoff valve 7 in response to the energization.

The built-in coil of the power relay 43a is connected in series with the light receiving portion 6b of the foreign matter sensor 6 using an optical sensor. As described above, the light receiving section 6b is a switch that is turned on when the amount of received light reaches a predetermined level, and the power relay 4b
The built-in coil of 3a is excited according to the ON operation of the light receiving section 6b. Thus, the power relay 43a is turned on when the amount of light received by the light receiving section 6b reaches a predetermined level, and the power relay 43a and the control relay 43b which is always on.
The fuel cutoff valve 7 is energized via the
Are stopped by shutting off the fuel.

The light emitting portion 6a of the foreign matter sensor 6 is connected to the power source through the main switch M which is turned on prior to the start of use of the device of the present invention, and always emits light of a predetermined level. . Then, this light emission is captured by the light receiving portion 6b as reflected light from a foreign substance existing in a predetermined work area, and the engine E is stopped as described above when the light receiving amount of the light receiving portion 6b reaches a predetermined level. The rotation of the winch roller 3 is stopped in an emergency according to the presence of a worker detected as a foreign matter, and the occurrence of an accident involving the worker can be prevented.

On the other hand, the built-in coil of the control relay 43b is connected in series with the engine stop switch 8 attached to the engine E. The engine stop switch 8 is a switch that is turned on in response to the stop of the engine E, and is disposed, for example, on the discharge side of a hydraulic pump driven by the engine E in order to obtain the hydraulic pressure to be fed to the hydraulic equipment of each part of the vehicle 4. Thus, a pressure switcher or the like that is turned on in response to the loss of oil pressure can be used.

That is, the built-in coil of the control relay 43b is excited in response to the stop of the engine E, and the excitation causes the control relay 43b to turn off. As a result, the fuel cutoff valve is closed in response to the detection of the foreign matter sensor 6. 7 is automatically returned to the open state on condition that the engine E is stopped, and the engine E is ready to be restarted immediately after the above-mentioned emergency stop. This is necessary in order to enable a quick restart when the engine E is unnecessarily stopped due to an erroneous detection of the foreign matter sensor 6.

The erroneous detection of the foreign matter sensor 6 is, for example, the careless crossing of the detection area by the operator, the detection of foreign matter outside the detection area due to defective sensitivity adjustment or mounting, and the like. Power relay to eliminate the effect of detection
It is desirable that a relay that is turned on when a large current is applied is used as 43a, and that the power relay 43a is turned on after a predetermined time has passed after the foreign object sensor 6 was turned on.

The built-in solenoid of the fuel cutoff valve 7 is also connected to a power source through a push button type emergency stop switch 45 arranged in the switch box 44, and by pressing the emergency stop switch 45, Engine E
The emergency stop can be made.

The restart switch 46 arranged in the switch box 44 is connected to the starter motor 9 attached to the engine E, and when the restart switch 46 is pressed after the engine E is stopped, this restart switch 46 is pressed. During this period, the starter motor 9 is driven and the engine E is restarted. That is, when the engine E is stopped in response to the detection of a foreign substance by the foreign substance sensor 6 or the operation of the emergency stop switch 45, the restart switch 46 outside the vehicle 4 is operated without operating the key switch in the cab 41. The engine E can be restarted by the operation of.

In the apparatus of the present invention, as described above, the fuel cutoff valve 7 is automatically returned to the open position after the engine E is stopped in response to the detection of the foreign matter sensor 6, so that the restart switch 46 or the There is no problem in restarting the engine E by operating the key switch.

[0051]

As described in detail above, in the device of the present invention, the approach of the worker to the periphery of the shaft winch is caused by foreign matter existing in a predetermined working area including the extension line of the axle to which the shaft winch is attached. It is detected by the foreign matter sensor, and the engine that is the drive source of the shaft winch is stopped according to this detection, so it is possible to prevent the occurrence of accidents involving workers, and the detection by the foreign matter sensor interferes with normal work. As a result, the shaft winch can be safely used as a simple means for extracting the rotational force.

Further, since the engine is stopped in response to the detection of the foreign matter sensor by closing the fuel cutoff valve arranged in the fuel supply system, an emergency stop of the shaft winch occurs reliably and promptly. Is detected, and the fuel cutoff valve is automatically returned to the open position in response to this detection.For example, it is easy to restart the engine after an erroneous emergency stop or after the sensitivity adjustment work of the foreign matter sensor, It is possible to quickly return to normal work.

Further, as the foreign matter sensor, an optical sensor or an ultrasonic wave sensor which emits light or ultrasonic waves toward the work area and changes the output thereof by capturing the reflection from the foreign matter is adopted. The present invention has excellent effects such as the possibility of detecting a foreign substance that does not exist.

[Brief description of drawings]

FIG. 1 is a schematic side view of a vehicle equipped with the device of the present invention.

FIG. 2 is a perspective view of the vicinity of attachment of a sensor box containing a foreign matter sensor.

FIG. 3 is a block diagram of a control system of the device of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a transmission system for driving wheels of a vehicle.

FIG. 5 is an operation explanatory view of a shaft winch.

FIG. 6 is an operation explanatory view of a shaft winch.

[Explanation of symbols]

 3 Winch roller 4 Vehicle 5 Sensor box 6 Foreign matter sensor 7 Fuel shutoff valve 8 Engine stop switch 43 Circuit box 43a Power relay 43b Control relay 44 Switch box 45 Emergency stop switch 46 Restart switch 47 Connector 50 Rectangular window 51 Suspended arm 54 Signal Line D Differential E Engine W Drive Wheel

Claims (5)

[Claims] 1. A driving force of an engine mounted on a vehicle is detachably connected to an axle to which a driving force of the engine is transmitted from a driving wheel driven by the axle, while maintaining the grounding state of the driving wheel. A device for automatically stopping a shaft winch configured to extract the rotation of the axle as a rotational force for external work in an emergency, the device being detachably attached to a part of the vehicle and extending to the outside of the axle. A foreign matter sensor for detecting foreign matter existing in a predetermined work area including
An emergency stop assist device for a shaft winch, comprising: engine control means for stopping the engine in response to detection of the foreign matter sensor. 2. The emergency stop assist device for a shaft winch according to claim 1, wherein the engine control means stops the engine by closing a fuel cutoff valve arranged in a fuel supply system of the engine. 3. The shaft winch according to claim 2, wherein the engine control means includes means for detecting a stop of the engine, and return means for returning the fuel cutoff valve to the open position in response to the detection by the means. Emergency stop assist device. 4. The foreign matter sensor is an optical sensor that emits light toward the work area and captures reflected light from the foreign matter to change its output. Emergency stop assist device for shaft winch. 5. The ultrasonic sensor according to claim 1, wherein the foreign matter sensor emits ultrasonic waves toward the work area, captures a reflected wave from the foreign matter, and changes its output. Emergency stop assist device for the described shaft winch.